参数资料
型号: ZL50408GDG2
厂商: CONEXANT SYSTEMS
元件分类: 网络接口
英文描述: DATACOM, LAN SWITCHING CIRCUIT, PBGA208
封装: 17 X 17 MM, 1.40 MM HEIGHT, LEAD FREE, MO-192, LBGA-208
文件页数: 94/144页
文件大小: 1779K
代理商: ZL50408GDG2
ZL50408
Data Sheet
53
Zarlink Semiconductor Inc.
Figure 13 - Remote Loopback Test
10.0
Clocks
10.1
Clock Requirements
10.1.1
System Clock (SCLK) Speed Requirement
SCLK is the primary clock for the ZL50408 device. The speed requirement is based on the system configuration.
Below is a table for a few configuration.
10.1.2
RMAC Reference Clock (M_CLK) Speed Requirement
M_CLK is a 50 MHz clock used for the RMAC ports (ports 0-7) and CPU port (port 8).
If none of the RMAC ports are configured in RMII mode or Reverse MII mode, a different clock frequency can be
applied to M_CLK, as long as it's less than 50 MHz. In this case, register USD must be set to provide an internal
1usec timing.
10.1.3
GMAC Reference Clock (GREF_CLK) Speed Requirement
GREF_CLK is a 125 MHz reference clock required for the GMAC port (port 9).
If the device is in a 9 port 10/100 configuration only, GREF_CLK can be a lower frequency clock and can be
connected to M_CLK to reduce the number of clock sources.
If port 9 is not being used, GREF_CLK can be left unconnected.
10.1.4
JTAG Test Clock (TCK) Speed Requirements
TCK is a clock used for the JTAG port. The frequency on this clock can vary. Refer to “JTAG (IEEE 1149.1-2001)”
on page 142 for the frequency range.
Configuration
Minimum SCLK speed
required
8 Port 10/100M + 1 port 1000M
100 MHz
6-9 ports 10/100 M
50 MHz
1-5 ports 10/100 M
25 Mhz
Table 11 - SCLK Speed Requirements
DEVICE B
DEVICE A
CPU
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